Ed,
Be very careful with the cal. alum. cement. Yes it goes off quickly and all the tech specs say DON"T add more water to make it more workable. It's gone off and its strength will be compromised. Also the addition of lime is not recommended. I tried this but found that the lime acts as an accelerant making the stuff go off even faster. The tech data also confirms this. However I'm sure your build will come out ok just delete the lime from your mix and use small fresh batches. Good luck.

I am following your "I started my build" thread with interest. It sounds like, you have much patience and are being very methodical in your approach to building your wood-oven. I wish you all the best with your project and like "BREVAN" said.....don't forget to take pics.

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